/**
   A class to compare numbers.
*/
public class Numbers
{
   /**
      Checks whether three numbers have all the same sign.
      @return true if all of the numbers a, b, and c have the same sign
   */
   public boolean allSameSign(int a, int b, int c)
   {
      // your work here
      if(a==0 && b==0 && c==0)
      return true;
      else
      return (a*b>0 && a*c>0 && b*c>0);
   }
}